Artist.

Japanese name: ゆずゆなぎ (Yuzuyunagi or Yuzu Yunagi)
Circle & site name: ぐるぐるどろっぷ (Guruguru Drop)

See also

• Blog: http://gurugurudrop.blog89.fc2.com/
• Pixiv account: http://www.pixiv.net/member.php?id=245753